Several mostly functional reimplementations of the Direct3D API have been made by third parties such as Wine, a project to port common Windows APIs to Unix-like operating systems, and Cedega, a proprietary fork of Wine.
The proprietary Direct3D is officially implemented only on Microsoft's Windows family of operating systems, including embedded versions used in the Xbox family of video game consoles and Sega's Dreamcast. The following compares the two APIs, structured around various considerations mostly relevant to game development. The GLSL shader compilers of different vendors also show slightly different behavior. This means that some API functions may have slightly different behavior from one vendor to the next.
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With OpenGL, every vendor implements the full API in the driver.
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A significant difference however is that Direct3D implements the API in a common runtime (supplied by Microsoft), which in turn talks to a low-level device driver interface (DDI). OpenGL and Direct3D are both implemented in the display device driver. Note that many essential OpenGL extensions and methods, although documented, are also patented, thus imposing serious legal troubles to implement them (see issues with Mesa ). OpenGL is an open standard API that provides many functions to render 2D and 3D graphics, and is available on most modern operating systems including but not limited to Windows, macOS, and Linux.It was designed by Microsoft Corporation for use on the Windows platform. Direct3D is a proprietary API by Microsoft that provides functions to render two-dimensional (2D) and three-dimensional (3D) graphics, and uses hardware acceleration if available on the graphics card.In more detail, the two computer graphics APIs are the following: Windows Embedded, Windows CE (through Direct3D Mobile)
Most notably, OpenGL is the dominating graphics API of Unix-like computer systems.įrom an application developer's perspective, Direct3D and OpenGL are equally open full documentation and necessary development tools are available with no restrictions.
OpenGL implementations exist for a wide variety of platforms. The OpenGL API is an open standard, which means that various hardware makers and operating system developers can freely create an OpenGL implementation as part of their system.
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